Primary Scintillation As Fast Trigger For Gas Scintillation Proportional Counters

We report measurements supporting the feasibility of exploiting primary scintillation in xenon as fast trigger for deconvolving off penetration depth effects of energetic X-rays (E > 20 keV). The application of the technique to high pressure position sensitive gas scintillation proportional counters when used in conjunction with wide field (30° x 30°) coded masks is discussed.